Automation System
Direct Numerical Control means:

complete elimination of a need for a human operator.
using one computer to control several machines
using several computers to control one large machine
eliminating computers from the manufacturing process
None of these

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Automation System
A venturi tube:

measures the presence of a liquid
None of these
is made only of metal
can be used to measure gas or liquid flow rates
is extremely difficult to use

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Automation System
What is offset error?

the difference between the controller output and the setting of the manipulated variable.
None of these
the difference between the control setpoint value and the actual value.
the difference between the sensor input and the absolute sensed parameter.
All of these

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